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.TH FCLOSE 3C "March 25, 2020"
.SH NAME
fclose \- close a stream
.SH SYNOPSIS
.nf
#include <stdio.h>

\fBint\fR \fBfclose\fR(\fBFILE *\fR\fIstream\fR);
.fi

.SH DESCRIPTION
The \fBfclose()\fR function causes the stream pointed to by \fIstream\fR to be
flushed and the associated file to be closed. Any unwritten buffered data for
the stream is written to the file; any unread buffered data is discarded. The
stream is disassociated from the file. If the associated buffer was
automatically allocated, it is deallocated.
.sp
.LP
The \fBfclose()\fR function marks for update the \fBst_ctime\fR and
\fBst_mtime\fR fields of the underlying file if the stream is writable and if
buffered data has not yet been written to the file.  It will perform a
\fBclose\fR(2) operation on the file descriptor that is associated with the
stream pointed to by \fIstream\fR.
.sp
.LP
After the call to \fBfclose()\fR, any use of \fIstream\fR causes undefined
behavior.
.sp
.LP
The \fBfclose()\fR function is performed automatically for all open files upon
calling \fBexit\fR(2).
.SH RETURN VALUES
Upon successful completion, \fBfclose()\fR returns \fB0\fR. Otherwise, it
returns \fBEOF\fR and sets \fBerrno\fR to indicate the error.
.SH ERRORS
The \fBfclose()\fR function will fail if:
.sp
.ne 2
.na
\fB\fBEAGAIN\fR\fR
.ad
.RS 10n
The \fBO_NONBLOCK\fR flag is set for the file descriptor underlying
\fIstream\fR and the process would be delayed in the write operation.
.RE

.sp
.ne 2
.na
\fB\fBEBADF\fR\fR
.ad
.RS 10n
The file descriptor underlying stream is not valid.
.RE

.sp
.ne 2
.na
\fB\fBEFBIG\fR\fR
.ad
.RS 10n
An attempt was made to write a file that exceeds the maximum file size or the
process's file size limit; or the file is a regular file and an attempt was
made to write at or beyond the offset maximum associated with the corresponding
stream.
.RE

.sp
.ne 2
.na
\fB\fBEINTR\fR\fR
.ad
.RS 10n
The \fBfclose()\fR function was interrupted by a signal.
.RE

.sp
.ne 2
.na
\fB\fBEIO\fR\fR
.ad
.RS 10n
The process is a member of a background process group attempting to write to
its controlling terminal, \fBTOSTOP\fR is set, the process is neither ignoring
nor blocking \fBSIGTTOU\fR and the process group of the process is orphaned.
\fIstream\fR was created by \fBopen_wmemstream\fR(3C) and a wide-character or
byte sequence buffered is invalid in the current locale.
.RE

.sp
.ne 2
.na
\fB\fBENOSPC\fR\fR
.ad
.RS 10n
There was no free space remaining on the device containing the file.
.RE

.sp
.ne 2
.na
\fB\fBEPIPE\fR\fR
.ad
.RS 10n
An attempt is made to write to a pipe or \fBFIFO\fR that is not open for
reading by any process. A \fBSIGPIPE\fR signal will also be sent to the calling
thread.
.RE

.sp
.LP
The \fBfclose()\fR function may fail if:
.sp
.ne 2
.na
\fB\fBENXIO\fR\fR
.ad
.RS 9n
A request was made of a non-existent device, or the request was beyond the
limits of the device.
.RE

.SH ATTRIBUTES
See \fBattributes\fR(7) for descriptions of the following attributes:
.sp

.sp
.TS
box;
c | c
l | l .
ATTRIBUTE TYPE	ATTRIBUTE VALUE
_
Interface Stability	Standard
_
MT-Level	MT-Safe
.TE

.SH SEE ALSO
.BR close (2),
.BR exit (2),
.BR getrlimit (2),
.BR ulimit (2),
.BR fcloseall (3C),
.BR fopen (3C),
.BR stdio (3C),
.BR attributes (7),
.BR standards (7)
